- Joined Mar 1, 2017
Please provide good image of component- Semitronics doesn't show a 1N1148 in their rectifier datasheet:It seems to be an old, outdated Diode but my circuit needs one and I'm having a hard time finding a replacement.
Here is all the data I can gather on it.. The one I took off the PCB looked like a regular Zener dioide to me.
In addition, I don't fully understand this data.
View attachment 244988
It's in a 300watt inverterThe data you show in post#1 for the 1N1148 does not agree with other datasheets I found for that device. Your data is for a very high voltage low current diode. The data sheet I have found for a 1N1148 is for a 35 amp 100 volt PIV diode. What is the application that you plan to use this diode for ?
The listing shown appears to be incomplete. I noticed that.
I understand. but what choice do I have at this point?To assume that the diode in question is the same as the others on the board would be ill-advised.
It is a TrippLite 300Watt inverterThere are still many leads for you to pursue.
1) What does the unit do? Make and model? Post a photo of the nameplate.
2) Post photos of full view top and bottom.
3) Post photos of close ups, top and bottom.
4) Attempt to reverse engineer the board.
5) The diode is beside an IC. What is the part number of that IC?
6) At the very least, reverse engineer the circuity around the diode and the IC.
Fortunately, the board is marked as to it's orientation.The diode shown in post #6 does not look like the diode I found under the part number 1N1148 or the one you found with a PIV rating of 14000 volts. Even if you find the correct diode as you say it is missing you will not know the way to insert it as I can't see any polarity markings on the board. What is the history of the board ? I suspect you may have misread one digit of the part number and if my guess is correct it would be a very common diode. (I think other members may make the same guess.) Check the part number carefully. and report your findings. What evidence do you have that replacing the diode will fix the problem with the board ?
If you trace out the schematic of the board it is possible we could suggest a suitable device.
I took a loupe and examined the diode as carefully as I could. The markings are rather blurry and not well printed so it's not easy.Are you're it is not a 1N4148 - one of the most common diodes known in the industry? (Outside the 1N400x series).
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by Jake Hertz
by Jake Hertz